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PMID: 2335818 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Secondary structure of the human T-cell leukemia virus type 1 rex-responsive element is essential for rex regulation of RNA processing and transport of unspliced RNAs.

Journal of virology ·Vol. 64 ·No. 6 ·1990-06-00 ·Pages 2825-32

Toyoshima H, Itoh M, Inoue J, Seiki M, Takaku F, Yoshida M

Abstract

Rex protein of human T-cell leukemia virus type 1 (HTLV-1) induces cytoplasmic expression of unspliced gag/pol mRNA and singly spliced env mRNA and thus is essential for replication of the virus. This regulation requires a cis-acting rex-responsive element (RXE), located in the 3' region of the viral RNA. By external deletion, we have identified RXE composed of 205 nucleotides. The secondary structure of RXE was confirmed by studies on its susceptibility to nuclease digestions to consist of four stem-loops and a long stretch of stem structure. Substitution and deletion mutations revealed that two regions of the stem-loops and their secondary structures are essential for rex regulation. Similar secondary structures were found in the corresponding regions of HTLV-2, bovine leukemia virus and human immunodeficiency virus. Furthermore, a sequence of 11 nucleotides in the RXE was found to be conserved in the secondary structures of HTLV-1, HTLV-2, and bovine leukemia virus. These observations suggest that the secondary structure as well as the conserved sequence may be important in expression of unspliced RNA even with diverged sequences as observed in these viruses.

MeSH Terms
Base Sequence Cell Line Chromosome Deletion Human T-lymphotropic virus 1/genetics Humans Molecular Sequence Data Nucleic Acid Conformation Plasmids Proviruses/genetics RNA, Messenger/genetics RNA, Viral/genetics,metabolism Trans-Activators/metabolism Transcriptional Activation Transfection
Chemicals
RNA, Messenger RNA, Viral Trans-Activators
Authors & Affiliations
6 authors, click to expand affiliations / ORCID
Toyoshima H
Department of Viral Oncology, Cancer Institute, Tokyo, Japan.
Itoh M
Inoue J
Seiki M
Takaku F
Yoshida M
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Article Info
Journal
Journal of virology
Abbr.
J Virol
ISSN
0022-538X
DOI
10.1128/JVI.64.6.2825-2832.1990
Published
1990-06-00
Pages
2825-32
Language
English
Region
United States
NLM ID
0113724
PMCID
PMC249464
Subset
IM
External Links
PubMed source DOI: 10.1128/JVI.64.6.2825-2832.1990 PMC Full Text View journal details
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